ML20112H542
| ML20112H542 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 06/13/1996 |
| From: | Kansler M VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 96-274, NUDOCS 9606180277 | |
| Download: ML20112H542 (11) | |
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4 Vinom1A ELucriuC ann Powen COMI*ANY RicunoNo,VrHOINIA 20261 June 13, 1996 l
I Serial No.96-274 United States Nuclear Regulatory Commission NL&OS/EJW Document Control Desk Docket No.
50-338 Attention:
Washington, D.C. 20555 License No.
NPF-4 Gentlemen:
ylBGJNIA_E1ECTRIC AND POWEfLQOMPANY NORTH ANNAP_RWERSTATION UNIT _1 1RSIR_YKLE INSPECTION PROSRAM RELIEF REQUEST d ten year North Anna Power Station Unit 1 is currently in the third period of its sec ith ASME interval. The component examination program is conducted in accordan has been Section XI 1983 Edition, Summer 1983 Adden f
mination coverage of class 1 and class 2 welds.
hi the Six examinations performed during the 1996 Refueling Outage did n ASME Section XI required examination coverage of ASME Code Case h
examination coverage requirements of ASME Secti Code.
i l i in the current second interval program for North Anna Unit 1.
t Justification for the proposed exemptions from the impractical ex proved are provided in the attached relief requests. These relief requests h have any by the North Anna Station Nuclear Safety and Operating Commi questions or require additional information, please contact us.
Very truly yours,
[
ster esident - Nuclear Engineering and Services i
Attachments l'70033 I
- '861885 Mnske
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United States Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.
Suite 2900 Atlanta, GA 30323 Mr. R. D. McWhorter NRC Senior Resident inspector i
North Anna Power Station
ELELIEF RE_ QUEST NDE-21 1.
IDENTIFICATION OF COMPONENTS Mark / Weld #
Line#
Drawing Class SW-32 6"-RC-21-1502-01 11715-WMKS-0109G-2 1
SW-41 12"-RC-24-1502-01 11715-WMKS-0109G-2 1
SW-43 6"-RC-20-1502-01 11715-WMKS-0109G-2 1
II.
IMPRACTICABLE CODE REQUIREMENTS The 1983 edition summer 1983 addenda of ASME Section XI Table IWB-2500-1, examination category B-J, item number 89.31 does not allow any limitations to the required volumetric or surface examinations.
Code Case N-460, Altemative Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%.
Ill.
BASIS FOR RELIEF The components listed above have been examined to the extent practical as required by the Code. The Code required volumetric examination coverage was reduced due to nozzle configuration, weld joint geometry, and the material type from which the components are constructed. The scope of volumetric examination coverage completed for the above listed welds is listed in Table NDE-27-1. The required surface examinations had no limitations. Figure NDE-27-1 is provided detailing the limitations experienced.
Alternative components could not be substituted for examination due to the mandatory selection requirements of the Code.
IV.
ALTERNATE PROVISIONS lt is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.
i
Tcble NDE-27-1 North Anna Unit 1 Examination Coverage Estimates 11715-WMKS-0109G-2 Category B-J, item B9.31 9
UT Coverage %
Surface Examination Mark / Weld #
_2 3
1 3
Coverage %
Reason for Partial Examination SW-32 80 0
28 28 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. Due to change in configuration around the nozzle, the percent of volume varied around the circumference. The weld was examined to the maximum extent practical using the RTD search unit from the loop pipe side. Approximately 80% of the lower 1/3 of the weid was covered in the 2 direction.
SW-41 83 0
28 28 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. Due to change in configuration around the nozzle, the percent of volume varied around the circumference. The weld was examined to the maximum extent practical using the RTD search unit from the loop pipe side. Approximately 83% of the lower 1/3 of the weld was covered in the 2 direction.
SW-43 76 0
28 28 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. Due to change in configuration around the nozzle, the percent of volume varied around the circumference. The weld was examined to the maximum extent practical using the RTD search unit from the loop pipe side. Approximately 76% of the lower 1/3 of the weld was covered in the 2 direction.
UT Scan Direction Definitions f
2 - Axial scan,180 degrees from isometric flow direction (weld count).
5 - Axial scan, the same direction as the isometric flow (weld count).
7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.
8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.
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BELIEF REQUEST NDE-23 1.
IDENTIFICATION OF COMPONENTS Mark / Weld #
Line#
Drawing Class 32 31"-RC-8-1502-Q1 11715-WMKS-01093-1 1
33 271/2"-RC 9-1502-Q1 11715-WMKS-0109G-1 1
11.
IMPRACTICABLE CODE REQUIREMENTS The 1983 edition summer 1983 addenda of ASME Section XI Table IWB-2500-1, examination category B-J, item number B9.11 does not allow any limitations to the required volumetric or surface examinations.
Code Case N-460, Altemative Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%.
Ill.
BASIS FOR RELIEF The components listed above have been examined to the extent practical as required by the Code. The Code required volumetric examination coverage was reduced due to weld joint geometry, and the material type from which the components are constructed. The scope of volumetric examination coverage completed for the above listed welds is listed in Table NDE-28-1. The required surface examinations had no limitations. Figures NDE-28-1 and NDE-28-2 are provided detailing the limitations experienced. Altemative components could not be substituted for examination due to the mandatory selection requirements of the Code.
IV.
ALTERNATE PROVISIONS It is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.
l
)
Tcble NDE-28-1 North Anna Unit 1 Examination Coverage Estimates 11715-WMKS-0109G-1 Category B-J, item B9.11 UT Coverage %
Surface Examination Mark / Weld #
_2 3
.Z 3
Coverage %
Reason for Partial Examination 32 0
100 100 100 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting limit the use of an extended V-path examination. The weld was examined to i
the maximum extent practical using the 45' RTD search unit from the loop pipe side.
Approximately 100% of the lower 1/3 of the weld was covered in the 5 direction.
33 97 0
50 50 100 Nozzle / weld joint configuration and material type (ASTM A-351 austenitic steel casting) limit the use of an extended V-path examination. The weld was examined to t
the maximum extent practical using 45' and 60' RTD search units from the loop pipe side. Approximately 97% of the lower 1/3 of the weld was covered in the 2 direction.
i UT Scan Direction Definitions 2 - Axial scan,180 degrees from isometric flow direction (weld count).
5 - Axial scan, the same direction as the isometric flow (weld count).
7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.
8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.
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ELBOW - 5 SIDE WELD' l
COVERAGE ONE
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DIRECTION N V/A FLOW WELD 32 igure N J E -
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2 SIDE REACTOR COOLANT PUNP
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LOOP PIPING WELD 33 rigure NJE-28-2
RE_ LIEF REQUEST NDE-29 1.
IDENTIFICATION OF COMPONENT Mark / Weld #
Line#
Drawing Class SW-32 2"-RC-220-1502-01 11715 WMKS-0103BH 1
II.
IMPRACTICABLE CODE REQUIREMENTS The 1983 edition summer 1983 addenda of ASME Section XI Table IWB 2500-1, examination category B-J, item number B9.21 does not allow any limitations to the required surface examination.
Code Case N-460, Alternative Examination Coverage for Class 1 and Class 2 Welds, allows a reduction in coverage, if it is less than 10%.
Ill.
BASIS FOR RELIEF The component listed above has been examined to the extent practical as required by the Code Case.
The Code required surface examination coverage was reduced due to the interference with a steel beam above the weld.
This interference limited the examination of the weld to 6%" of the total 8", 81.25%.
Figure NDE-29-1 is provided detailing the limitations experienced. Altemative components could not be substituted for examination due to the mandatory selection requirements of the Inservice inspection Program for Class 1 piping welds which requires all welds adjacent to integral attachments to be examined.
IV.
ALTERNATE PROVISIONS It is proposed that the examinations already completed at the reduced coverage be counted as meeting the Code requirements.
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